Chipotle says criminal investigation widens

Chipotle says the scope of a previously disclosed federal criminal investigation has widened beyond a single restaurant in California.

The company says it has been served with another subpoena requiring more documents related to its company-wide food safety. Previously, it said it was served a subpoena in relation to a California restaurant, where there was a norovirus outbreak over the summer.

Chipotle also confirms its sales at established stores sank 14.6 percent for the fourth quarter after food scares sickened dozens of people around the country.